int (*receive_ungetc)(int) = stdin_ungetc;
int (*receive_feof)(void) = stdin_feof;
int (*receive_ferror)(void) = stdin_ferror;
int (*receive_ungetc)(int) = stdin_ungetc;
int (*receive_feof)(void) = stdin_feof;
int (*receive_ferror)(void) = stdin_ferror;